BRAIN TEASERS

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Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 25

The first user who solved this task is Djordje Timotijevic.

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Every time I go on vacation my wife gets pregnant...
This year I'm taking her with me!

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First successful steamboat

In 1783, the first successful steamboat, the Pyroscaphe, made a trial run on the River Saône in France. It was invented by a Frenchman, the Marquee Claude de Jouffroy d'Abbans. His earlier steam-powered boat tested in 1778 on the river Doubs used a Newcomen steam engine driving a hinged flap he modelled after the webbed feet of an aquatic bird, which was unsuccessful. He then built on ideas from James Watt's inventions to design a parallel-motion double-acting steam engine to drive a pair of large paddle wheels on the Pyroscaphe. Several thousand people viewed its trial, a 15 minute journey upstream on the River Saône. (Montgolfier's first balloon demonstration took place a few weeks earlier on 4 Jun 1783.)«

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